/* src/common/port/getopt.cpp */

/* This is used by psql under Win32 */

/*
 * Copyright (c) 1987, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *	  notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *	  notice, this list of conditions and the following disclaimer in the
 *	  documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *	  may be used to endorse or promote products derived from this software
 *	  without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.	IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 */

#include "c.h"

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getopt.c	8.3 (Berkeley) 4/27/95";
#endif /* LIBC_SCCS and not lint */

/*
 * On some versions of Solaris, opterr and friends are defined in core libc
 * rather than in a separate getopt module.  Define these variables only
 * if configure found they aren't there by default.  (We assume that testing
 * opterr is sufficient for all of these.)
 */
#ifndef HAVE_INT_OPTERR

int opterr = 1,      /* if error message should be printed */
    optind = 1,      /* index into parent argv vector */
    optopt;          /* character checked for validity */
char* optarg = NULL; /* argument associated with option */
#else

extern int opterr;
extern int optind;
extern int optopt;
extern char* optarg;
#endif

#define BADCH (int)'?'
#define BADARG (int)':'
#define EMSG ""

int getopt(int nargc, char* const* nargv, const char* ostr);

/*
 * getopt
 *	Parse argc/argv argument vector.
 *
 * This implementation does not use optreset.  Instead, we guarantee that
 * it can be restarted on a new argv array after a previous call returned -1,
 * if the caller resets optind to 1 before the first call of the new series.
 * (Internally, this means we must be sure to reset "place" to EMSG before
 * returning -1.)
 */
int getopt(int nargc, char* const* nargv, const char* ostr)
{
    static char* place = EMSG; /* option letter processing */
#ifdef WIN32
    const char* oli = NULL; /* option letter list index */
#else
    char* oli = NULL; /* option letter list index */
#endif
    if (!*place) { /* update scanning pointer */
        if (optind >= nargc || *(place = nargv[optind]) != '-') {
            place = EMSG;
            return -1;
        }
        if (place[1] && *++place == '-' && place[1] == '\0') { /* found "--" */
            ++optind;
            place = EMSG;
            return -1;
        }
    } /* option letter okay? */
    if ((optopt = (int)*place++) == (int)':' || !(oli = strchr(ostr, optopt))) {
        /*
         * if the user didn't specify '-' as an option, assume it means -1.
         */
        if (optopt == (int)'-') {
            place = EMSG;
            return -1;
        }
        if (!*place) {
            ++optind;
        }
        if (opterr && *ostr != ':') {
            (void)fprintf(stderr, "illegal option -- %c\n", optopt);
        }
        return BADCH;
    }
    if (*++oli != ':') { /* don't need argument */
        optarg = NULL;
        if (!*place) {
            ++optind;
        }
    } else { /* need an argument */
        if (*place) {
            /* no white space */
            optarg = place;
        } else if (nargc <= ++optind) { /* no arg */
            place = EMSG;
            if (*ostr == ':') {
                return BADARG;
            }
            if (opterr) {
                (void)fprintf(stderr, "option requires an argument -- %c\n", optopt);
            }
            return BADCH;
        } else {
            /* white space */
            optarg = nargv[optind];
        }
        place = EMSG;
        ++optind;
    }
    return optopt; /* dump back option letter */
}
